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Article overview
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A new class of actuator surface models for wind turbines | | Xiaolei Yang
; Fotis Sotiropoulos
; | | Date: |
12 Jan 2017 | | Abstract: | Actuator line model has been widely employed in wind turbine simulations.
However, the standard actuator line model does not include a model for the
turbine nacelle which can significantly impact turbine wake characteristics as
shown in the literature (e.g. Kang, Yang and Sotiropoulos, Journal of Fluid
Mechanics 744 (2014): 376-403; Viola et al., Journal of Fluid Mechanics 750
(2014): R1; Foti et al., Physical Review Fluids 1 (2016), 044407). Another
disadvantage of the standard actuator line model is that more geometrical
features of turbine blades cannot be resolved on a finer mesh. To alleviate
these disadvantages of the standard model, we develop a new class of actuator
surface models for turbine blades and nacelle to take into account more
geometrical details of turbine blades and include the effect of turbine
nacelle. The actuator surface model for nacelle is evaluated by simulating the
flow over periodically placed nacelles. Both the actuator surface simulation
and the wall-resolved large-eddy simulation are carried out. The comparison
shows that the actuator surface model is able to give acceptable results
especially at far wake locations on a very coarse mesh. The capability of the
actuator surface model in predicting turbine wakes is assessed by simulating
the flow over the MEXICO (Model experiments in Controlled Conditions) turbine
and the hydrokinetic turbine of Kang, Yang and Sotiropoulos (Journal of Fluid
Mechanics 744 (2014): 376-403). Comparisons of the computed results with
measurements show that the proposed actuator surface model is able to predict
the tip vortices, turbulence statistics and meandering of turbine wake with
good accuracy. | | Source: | arXiv, 1702.2108 | | Services: | Forum | Review | PDF | Favorites | |
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